Stomping Ground

({T}: Add {R} or {G}.) As Stomping Ground enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

Elvish Mystic

{T}: Add {G} to your mana pool.

Harnessed Lightning

Pithing Needle

As Pithing Needle comes into play, name a card. Activated abilities of sources with the chosen name can't be played unless they're mana abilities.

Steam Vents

Ulamog, the Ceaseless Hunger

Vessel of Nascency

Aether Hub

Aetherworks Marvel

Attune with Aether

Botanical Sanctum

Ceremonious Rejection

Spirebluff Canal

Emrakul, the Promised End

Ishkanah, Grafwidow

Servant of the Conduit

Whirler Virtuoso

Aethersphere Harvester

Rogue Refiner

Forest

({T}: Add {G}.)

Island

({T}: Add {U}.)

Mountain

({T}: Add {R}.)

Breeding Pool

({T}: Add {G} or {U}.) As Breeding Pool enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.